The direct current furnace only uses 1 to 2 graphite electrodes.Ģ. Since the AC furnace uses a three-phase power supply, 3 graphite electrodes are required. Save 1~2 sets of electrode devices than AC electric furnace. Such a working form is called a direct current submerged arc furnace.Ĭompared with AC electric furnace, DC electric furnace has the following advantages:ġ. These slag and charge cover the electric arc and form a submerged arc state. If the direct current furnace is used to smelt non-conductive ore, the solid material itself is not conductive, and a large amount of slag is produced during the smelting process. Such a working form is called DC electric arc furnace. If a DC electric furnace is used to melt steel, no slag is formed, and the solid materials themselves are conductive and work in the form of an open arc. In electric arc smelting, if the arc is not buried by the slag and charge and the arc can be seen, it is called an open arc if the arc is buried by the slag and charge and the arc is invisible, it is called a submerged arc. There is an essential difference between DC arc and AC arc: AC current crosses zero twice in each cycle, resulting in AC arc going through the arc starting and extinguishing process twice a week, the arc is unstable There is no arc extinction after the DC arc starts, and the arc light is very stable. Therefore, in production, people often use electric arc furnaces to smelt ores to obtain various rare metals and ferroalloys. It is easier to obtain such a high-temperature heat source by means of arc light than by other methods. The temperature of the arc core is as high as 10,000 degrees Celsius, and the temperature of the arc periphery is as high as 3,000 degrees Celsius. When the gas is ionized to form a conductive ion body, the gas column produces a strong bright light and extremely high temperature, which is the arc light. Direct current electric arc furnace and direct current submerged arc furnace are industrial furnaces that directly heat the charge with the heat of arc light.
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